title: Primary gamma delta cell clones can be defined phenotypically and functionally as Th1/Th2 cells and illustrate the association of CD4 with Th2 differentiation.
abstract: The division of CD4+ alpha beta T cells into Th1 and Th2 subsets has become an established and important paradigm. The respective activities of these subsets appear to have profound effects on the course of infectious and autoimmune diseases. It is believed that specific programs of differentiation induce the commitment of an uncommitted Th0 precursor cell to Th1 or Th2. A component of these programs is hypothesized to be the nature of MHC-peptide antigen presentation to the alpha beta T cell. It has heretofore remained uncertain whether a Th1/Th2 classification likewise defines, at the clonal level, gamma delta T cells. Such cells do not, as a general rule, express either CD4 or CD8 alpha beta, and they do not commonly recognize peptide-MHC. In this report, gamma delta cell clones are described that conform strikingly to the Th1/Th2 classification, both by cytokine expression and by functional activities of the clones in vitro and in vivo. Provocatively, both the gamma delta cell clones and primary gamma delta cells in vivo showed a strong association of the Th2 phenotype with CD4 expression. These results are discussed with regard to the immunoregulatory role that is increasingly emerging for gamma delta cells.
authors.affiliation: Department of Biology, Yale University, New Haven, CT 06511, USA.
authors.forename: L
authors.initials: L
authors.lastname: Wen
authors.forename: D F
authors.initials: DF
authors.lastname: Barber
authors.forename: W
authors.initials: W
authors.lastname: Pao
authors.forename: F S
authors.initials: FS
authors.lastname: Wong
authors.forename: M J
authors.initials: MJ
authors.lastname: Owen
authors.forename: A
authors.initials: A
authors.lastname: Hayday
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017209:Apoptosis; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism; D015704:CD4 Antigens / Q000502:physiology*; D002454:Cell Differentiation / Q000235:genetics / Q000276:immunology; D002478:Cells, Cultured; D002999:Clone Cells; D016207:Cytokines / Q000096:biosynthesis / Q000235:genetics; D053222:Fas Ligand Protein; D015870:Gene Expression; D017578:Immunoglobulin Class Switching / Q000276:immunology; D007132:Immunoglobulin Isotypes / Q000378:metabolism; D016130:Immunophenotyping; D008562:Membrane Glycoproteins / Q000096:biosynthesis / Q000235:genetics; D051379:Mice; D018345:Mice, Knockout; D016513:Mice, SCID; D008969:Molecular Sequence Data; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics* / Q000276:immunology* / Q000502:physiology; D018417:Th1 Cells / Q000737:chemistry / Q000276:immunology* / Q000378:metabolism; D018418:Th2 Cells / Q000737:chemistry / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D019014:fas Receptor / Q000096:biosynthesis / Q000235:genetics
chemical_list: D015704:CD4 Antigens; D016207:Cytokines; D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D007132:Immunoglobulin Isotypes; D008562:Membrane Glycoproteins; D016693:Receptors, Antigen, T-Cell, alpha-beta; D019014:fas Receptor